GB1321208A - Ring laser gyroscope linearization system - Google Patents

Ring laser gyroscope linearization system

Info

Publication number
GB1321208A
GB1321208A GB889870A GB889872A GB1321208A GB 1321208 A GB1321208 A GB 1321208A GB 889870 A GB889870 A GB 889870A GB 889872 A GB889872 A GB 889872A GB 1321208 A GB1321208 A GB 1321208A
Authority
GB
United Kingdom
Prior art keywords
output
signal
laser
counter
rotation rate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB889870A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boeing North American Inc
Original Assignee
North American Rockwell Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by North American Rockwell Corp filed Critical North American Rockwell Corp
Publication of GB1321208A publication Critical patent/GB1321208A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/08Construction or shape of optical resonators or components thereof
    • H01S3/081Construction or shape of optical resonators or components thereof comprising three or more reflectors
    • H01S3/083Ring lasers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C19/00Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
    • G01C19/58Turn-sensitive devices without moving masses
    • G01C19/64Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
    • G01C19/66Ring laser gyrometers
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C19/00Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
    • G01C19/58Turn-sensitive devices without moving masses
    • G01C19/64Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
    • G01C19/66Ring laser gyrometers
    • G01C19/661Ring laser gyrometers details
    • G01C19/665Ring laser gyrometers details control of the cavity

Abstract

1321208 Lasers NORTH AMERICAN ROCKWELL CORP 25 Feb 1972 [19 April 1971] 8898/72 Heading G4H [Also in Division H1] In a ring laser which exhibits a non-linear characteristic in regions just above its lock-in rotation rate, the cosine of the ring output beat frequency is used to control one of the laser resonator mirrors and the sine of the output is used to derive a corrected signal which represents the true rotation rate of the laser. In Fig. 1 the apparent rotation rate given by a ring laser is plotted against its actual rotation rate Q. As is usual there is a minimum rotation rate Q L below which the laser gives zero output, the present invention does not affect this. There is also a region 7 where there is an output from the laser, but its value is incorrect. The ring laser shown in Fig. 3 is controlled so that its output may be corrected to give the true rotation rate shown at 6 in Fig. 1. In Fig. 3 one output beam from the laser 12 passes to photodetector 1 via a beam splitter 18, while the other output beam is first reflected by a vibratable mirror 11 before reaching the beam splitter. The combined beams are incident on the photodetector 1, and produce a sine function signal as shown in Fig. 4. This sine function is integrated to give a cosine signal at 2 in Fig. 3, and is passed to a counter 3. The counter is of the type which adds when the cosine signal is +<SP>ve</SP> and subtracts when it is -<SP>ve</SP>; the counter also receives a clock signal, so that its output is representative of the difference in the length of time of + <SP>ve</SP> and - <SP>ve</SP> half cycles of the cosine signal. The output is passed via D to A converter and a transfer network 5 to a piezoelectric mirror mount 24, the motion of the mirror being such as to minimize the difference between the length of the half cycles of the cosine signal. A sine signal is shown in Fig. 4, and represents the output from the photodetector when the cosine half cycles have been made equal in time. The sine signal is fed to a counter 7 which works in the same manner as the previous counter 3 so as to give a signal representing T 1 -T 2 on Fig. 4. It is also fed to a counter 8 which produces a signal representing T 1 +T 2 ; the two signals are passed to a ratio multiplier 9 to give a signal (#)/(2).(T 1 -T 2 )/(T 1 +T 2 ). The cosecant of this is generated at 16 and passed to a linear accumulator 17. The output from the accumulator forms the corrected output of the ring laser shown at 6 in Fig. 1.
GB889870A 1971-04-19 1972-02-25 Ring laser gyroscope linearization system Expired GB1321208A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13520071A 1971-04-19 1971-04-19
FR7213562A FR2180471B1 (en) 1971-04-19 1972-04-18

Publications (1)

Publication Number Publication Date
GB1321208A true GB1321208A (en) 1973-06-27

Family

ID=26217031

Family Applications (1)

Application Number Title Priority Date Filing Date
GB889870A Expired GB1321208A (en) 1971-04-19 1972-02-25 Ring laser gyroscope linearization system

Country Status (5)

Country Link
US (1) US3721497A (en)
CA (1) CA964754A (en)
DE (1) DE2218397C3 (en)
FR (1) FR2180471B1 (en)
GB (1) GB1321208A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126776A (en) * 1982-08-26 1984-03-28 British Aerospace Ring laser gyroscopes

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4152071A (en) * 1976-08-02 1979-05-01 Honeywell Inc. Control apparatus
US4132482A (en) * 1977-09-12 1979-01-02 The Singer Company Feedback system for a ring laser gyro
FR2454100A1 (en) * 1979-04-09 1980-11-07 Schnerb Pierre Angular speed measurement using optical method - utilises frequency responses of two beams travelling in opposing directions
GB2126336B (en) * 1982-08-26 1986-07-09 British Aerospace Detection of movement of a cyclic interference waveform such as in a ring laser gyroscope
US4681446A (en) * 1984-06-11 1987-07-21 Rockwell International Corporation Phase conjugate fiber gyroscope
US4783169A (en) * 1985-08-09 1988-11-08 Litton Systems, Inc. Control of a ring laser gyro cavity according to a preselected model
WO2018023033A1 (en) 2016-07-29 2018-02-01 Western Michigan University Research Foundation Magnetic nanoparticle-based gyroscopic sensor
RU2724306C1 (en) * 2020-01-31 2020-06-22 Акционерное общество "Научно-исследовательский институт "Полюс" им. М.Ф. Стельмаха" Method for desynchronization of dynamic zones on frequency characteristic of a laser gyroscope
CN116448088B (en) * 2023-06-07 2023-09-05 中国船舶集团有限公司第七〇七研究所 Gyroscope correction device and correction method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1545411A (en) * 1966-11-29 1968-11-08 Sperry Rand Corp Ring laser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126776A (en) * 1982-08-26 1984-03-28 British Aerospace Ring laser gyroscopes

Also Published As

Publication number Publication date
DE2218397C3 (en) 1974-05-30
US3721497A (en) 1973-03-20
DE2218397A1 (en) 1972-11-02
CA964754A (en) 1975-03-18
DE2218397B2 (en) 1973-10-31
FR2180471B1 (en) 1974-12-20
FR2180471A1 (en) 1973-11-30

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PE20 Patent expired after termination of 20 years